Index Catalog // ScholarsArchive@OSU

Interdecadal changes in intensity of the oxygen minimum zone off Concepción, Chile (~ 36° S), over the last century

Creator:: Srain, B., Pantoja, S., Sepúlveda, J., Lange, C. B., Muñoz, P., Summons, R. E., McKay, J., and Salamanca, M.
Abstract:: We reconstructed oxygenation changes in the upwelling ecosystem off Concepción (36° S), Chile, using inorganic and organic proxies in a sediment core covering the last ca. 110 years of sedimentation in this area. Authigenic enrichments of Mo, U and Cd were observed between ca. 1935 and 1971 CE, implying a...
Resource Type:: Article

Inter-decadal changes in the intensity of the Oxygen Minimum Zone off Concepción, Chile (~ 36° S) over the last century

Creator:: Srain, B., Pantoja, S., Sepúlveda, J., Lange, C. B., Muñoz, P., Summons, R. E., McKay, J., and Salamanca, M.
Abstract:: We reconstructed oxygenation changes in the Oxygen Minimum Zone of the upwelling ecosystem off Concepción (36° S), Chile, using inorganic and organic proxies in a sediment core covering the last ca. 110 years of sedimentation in this area. Authigenic enrichments of Mo, U and Cd were observed between ca. 1935–1971...
Resource Type:: Article

Ground Beetle (Coleoptera: Carabidae) Populations In Commercial Organic And Conventional Potato Production

Creator:: Rondon, Silvia I., Pantoja, Alberto, Hagerty, Aaron, and Horneck, Donald A.
Abstract:: In 2 consecutive years, ground beetles (Coleoptera: Carabidae) were sampled in commercial organic and conventional potato fields, using pit fall traps. Four conventional and 3 organic potato fields were surveyed to determine ground beetle taxa composition. In a related study, potato fields were assigned to 1 of 4 transitional systems...
Resource Type:: Article
Full Text:: University, Hermiston Agricultural Research and Extension Center, 2121 S. First Street, Hermiston, OR

Economic Evaluation of Fisheries Policies in Lamon Bay, Philippines

Creator:: Campos, Maria Rebecca, Pantoja, Blanquita, Manalili, Nerlita, and Bravo, Marideth
Abstract:: Lamon Bay is one of the most important fishing grounds in the Philippines. In spite of this, most fishermen in the area live in poverty, and their plight is getting worse, not better. Fish catch is declining by 13.5 % a year, more than double the decline experienced elsewhere in...
Resource Type:: Research Paper
Full Text:: EVALUATION OF FISHERIES POLICIES IN LAMON BAY, PHILIPPINES MARIA REBECCA CAMPOS, BLANQUITA PANTOJA, NERLITA

Trophic structure of the bathyal benthos at an area with evidence of methane seep activity off southern Chile (∼45°S)

Creator:: Zapata-Hernández, Germán, Sellanes, Javier, Thurber, Andrew R., and Levin, Lisa A.
Abstract:: Through application of carbon (C) and nitrogen (N) stable isotope analyses, we investigated the benthic trophic structure of the upper-slope off southern Chile (~45°S) including a recent methane seep area discovered as part of this study. The observed fauna comprised 53 invertebrates and seven fish taxa, including remains of chemosymbiotic...
Resource Type:: Article
Full Text:: evidence of methane seep activity off southern Chile (~45°S) Trophic structure of the bathyal benthos at

Biogeochemical Processing of Freshwater Carbon in the Anthropocene

Creator:: Buser, Jessica Z.
Abstract:: Freshwater systems cycle carbon along a spatial and temporal biogeochemical continuum, across which ecosystem processes contribute to transformations of organic matter (OM). Various ecological constraints impact rates OM transformation and production and consumption of the energetic end of respiration, methane. Microbiological processing and complete reduction of carbon substrates to methane...
Resource Type:: Dissertation
Full Text:: Anthropocene Abstract approved: ______________________________________________________ Frederick S

Establishment tolerance of six native sagebrush steppe species to imazapic (PLATEAU®) herbicide implications for restoration and recovery

Creator:: Bekedam, Steven
Abstract:: Scientists and land managers realize that integrated weed management (IWM) strategies are needed to attain successful and lasting improvements of weed infested landscapes. At this time no broadly reliable and environmentally safe IWM strategy has been developed to control exotic annual grasses that dominate many ecosystems of the northern Great...
Resource Type:: Masters Thesis
Full Text:: discovered in the mid 1970's, inhibit amino acid synthesis in plant cells through the inactivation of the

Diversity and Activity of Microbial Extracellular Peptidases in Soil

Creator:: Nguyen, Trang T. H.
Abstract:: Soil nitrogen exists largely as organic matter, including plant liter, dead animal matter, and microbial necromass. About 90% of soil organic nitrogen is proteinaceous material that is too large for plants and microorganisms to assimilate directly. Protein depolymerization therefore plays a critical role in mobilizing this organic source of nitrogen,...
Resource Type:: Dissertation
Full Text:: the average numbers of each peptidase super-family (S for serine, M for metallo-, C for cysteine, T

Distributions of Extracellular Peptidases Across Prokaryotic Genomes Reflect Phylogeny and Habitat

Creator:: Nguyen, Trang T. H., Myrold, David D., and Mueller, Ryan S.
Abstract:: Proteinaceous compounds are abundant forms of organic nitrogen in soil and aquatic ecosystems, and the rate of protein depolymerization, which is accomplished by a diverse range of microbial secreted peptidases, often limits nitrogen turnover in the environment. To determine if the distribution of secreted peptidases reflects the ecological and evolutionary...
Resource Type:: Article
Full Text:: and Ryan S. Mueller2 1 Department of Crop and Soil Science, Oregon State University, Corvallis, OR

Performance of broilers and layers fed crab meal and other substances for improving utilization of diets containing whey or cellulose

Creator:: Tachasirinugune, Sommai
Abstract:: Several experiments involving broilers and laying hens were conducted to study the effects of feeding crab meal, dried whey and cellulose. The positive responses of crab meal as a substance for improving the utilization of dried whey and cellulose were examined. Cellulose treated with concentrated H3PO4 in broiler diets and...
Resource Type:: Dissertation
Full Text:: my graduate committee members, Drs. David C. England, Harry S. Nakaue, Roger G. Petersen and

ScholarsArchive@OSU

Interdecadal changes in intensity of the oxygen minimum zone off Concepción, Chile (~ 36° S), over the last century

Inter-decadal changes in the intensity of the Oxygen Minimum Zone off Concepción, Chile (~ 36° S) over the last century

Ground Beetle (Coleoptera: Carabidae) Populations In Commercial Organic And Conventional Potato Production

Economic Evaluation of Fisheries Policies in Lamon Bay, Philippines

Trophic structure of the bathyal benthos at an area with evidence of methane seep activity off southern Chile (∼45°S)

Biogeochemical Processing of Freshwater Carbon in the Anthropocene

Establishment tolerance of six native sagebrush steppe species to imazapic (PLATEAU®) herbicide implications for restoration and recovery

Diversity and Activity of Microbial Extracellular Peptidases in Soil

Distributions of Extracellular Peptidases Across Prokaryotic Genomes Reflect Phylogeny and Habitat

Performance of broilers and layers fed crab meal and other substances for improving utilization of diets containing whey or cellulose

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